Multi-function bone conducting headphones

ABSTRACT

The present disclosure describes a multi-mode headset incorporating both bone conduction and aural transducers. Bone conduction plates of the headset rest on a users&#39; temples, just in front of each ear in one implementation, and create sound through vibrations in a first mode, allowing the user to listen to the headset while still leaving environmental or external sounds audible. In a second mode, the user detaches aural transducers or earbuds from an attachment point and inserts them into the user&#39;s ears, blocking external noise and providing passive and/or active noise isolation. In a third mode, both the bone conduction plates and aural transducers may be used simultaneously, providing additional amplitude and potentially wider frequency response. The headset may include a switch, such as a magnetic proximity sensor detecting the position of the aural transducers, to control a mixer or amplifier to re-route audio through the aural transducers. Accordingly, the user may switch between modes and listen to high quality, noise-isolated audio; or audio while remaining aware of external noises.

RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 15/179,283, entitled “Multi-Function Bone Conducting Headphones,”filed Jun. 10, 2016, which application claims priority to and thebenefit of U.S. Provisional Patent Application No. 62/288,915, entitled“Multi-Function Bone Conducting Headphones,” filed Jan. 29, 2016, theentirety of both applications is hereby incorporated by reference.

FIELD

The present application relates to headsets for audio reproduction,including both a bone conduction and aural transducer.

BACKGROUND

Bone conduction transducers provide a user with the ability to listen toaudio recordings or transmissions, while leaving the ears unblocked toreceive ambient or environmental sound. Headsets using such a system areparticularly desired for outdoor sports (e.g. jogging, bicycling, etc.),where a user may need to retain situational awareness of potentialenvironmental dangers. However, bone conduction transducers arefrequently frequency-limited, reducing the quality of audioreproduction. Similarly, because the user can hear environmental noises,the noise floor of such headsets is high, resulting in limited dynamicrange.

In-ear audio transducers, sometimes referred to as earbuds or earphonesand referred to generally as aural transducers, may provide higher audioquality, both through their interaction with the eardrum of the user,and via passive noise-reduction by physically sealing or blocking theear canal. However, aural transducers block ambient noise, and as suchmay be unsuitable or dangerous for outdoor sports.

SUMMARY

The present disclosure describes a multi-modal headset incorporatingboth bone conduction and aural transducers. Bone conduction plates ofthe headset rest on a users' temples, just in front of each ear in oneimplementation, and create sound through vibrations in a first mode,allowing the user to listen to the headset while still leavingenvironmental or external sounds audible. This allows a user to safelyride a bicycle or jog in traffic, allows athletes to communicate withteammates or competitors, and allows users to talk to friends or parentsmonitor children while listening to music. In a second mode, the userdetaches aural transducers or earbuds from an attachment point, such asa magnetic “nest” or retention element, and inserts them into the user'sears, blocking external noise and providing passive (and, in someimplementations, active) noise isolation. The headset may include aswitch, such as a magnetic proximity sensor detecting the position ofthe aural transducers, to control a mixer or amplifier to re-route audiothrough the aural transducers. In a third mode, both the bone conductionplates and aural transducers may be used simultaneously, providingadditional amplitude and potentially wider frequency response.Accordingly, the user may switch between modes and listen to highquality, noise-isolated audio; or audio while remaining aware ofexternal noises.

BRIEF DESCRIPTION OF THE FIGURES

The patent or application file contains at least one drawing executed incolor. Copies of this patent or patent application publication withcolor drawings will be provided by the Office upon request and paymentof the necessary fee.

FIG. 1A is an illustration of a multi-mode headset in a first,bone-conduction mode, according to one implementation;

FIG. 1B is an illustration of the multi-mode headset of FIG. 1A in asecond aural mode, according to one implementation;

FIG. 1C is an illustration of a portion of a multi-mode headset,according to one implementation;

FIG. 1D is an illustration of a multi-mode headset, according to anotherimplementation;

FIGS. 1E and 1F are isometric and side views of a multi-mode headset,according to another implementation;

FIG. 2 is a block diagram of an implementation of a multi-mode headset;

FIG. 3A is a schematic of a wireless power receiver for a multi-modeheadset, according to one implementation;

FIG. 3B is a schematic of a power supply for a multi-mode headset,according to one implementation;

FIG. 3C is a schematic of a memory device for a multi-mode headset,according to one implementation;

FIGS. 3D and 3E are a schematic of a processor and wireless interfacefor a multi-mode headset, divided across two figures for clarity,according to one implementation;

FIGS. 4A and 4B are isometric views of one implementation of amulti-mode headset;

FIGS. 4C-4H are plan views of the implementation of a multi-mode headsetof FIGS. 4A and 4B;

FIGS. 5A and 5B are isometric views of another implementation of amulti-mode headset;

FIGS. 5C-5H are plan views of the implementation of a multi-mode headsetof FIGS. 5A and 5B;

FIG. 5I is an exploded view of the implementation of a multi-modeheadset of FIGS. 5A and 5B;

FIGS. 6A and 6B are isometric views of another implementation of amulti-mode headset;

FIGS. 6C-6H are plan views of the implementation of a multi-mode headsetof FIGS. 6A and 6B;

FIG. 6I is an exploded view of the implementation of a multi-modeheadset of FIGS. 6A and 6B;

FIG. 7A is an illustration of another implementation of a multi-modeheadset;

FIGS. 7B and 7C are illustrations of portions of the implementation of amulti-mode headset of FIG. 7A;

FIG. 7D is an illustration of still another implementation of amulti-mode headset;

FIGS. 7E-7G are an isometric view, side view, and top view of animplementation of an earpiece for a multi-mode headset;

FIGS. 7H-7J are an isometric view, side view, and top view of animplementation of an audio-producing portion of a multi-mode headset;

FIGS. 7K-7M are an isometric view, side view, and top view of animplementation of an audio-producing portion of a multi-mode headset;

FIG. 8A is an illustration of another implementation of a multi-modeheadset;

FIGS. 8B and 8C are illustrations of left and right portions,respectively, of the implementation of a multi-mode headset of FIG. 8A;

FIGS. 8D and 8E are illustrations of left and right sides, respectively,of the implementation of a multi-mode headset of FIG. 8A;

FIG. 8F is an illustration of a rear portion of the implementation of amulti-mode headset of FIG. 8A;

FIGS. 8G and 8H are illustrations of a portion of the implementation ofa multi-mode headset of FIG. 8A in a bone-conduction and aural mode,respectively;

FIGS. 9A-9C are schematic diagrams of audio circuitry forimplementations of a multi-mode headset;

FIG. 10A are two isometric views of another implementation of amulti-mode headset;

FIGS. 10B and 10C are left and right views, respectively, of theimplementation of a multi-mode headset of FIG. 10A;

FIGS. 10D and 10E are top and bottom views, respectively of theimplementation of a multi-mode headset of FIG. 10A;

FIG. 10F is an isometric view of the implementation of a multi-modeheadset of FIG. 10A with aural transducers extended;

FIG. 10G is a side view of the implementation of a multi-mode headset ofFIG. 10A with aural transducers extended;

FIG. 10H is a top view of the implementation of a multi-mode headset ofFIG. 10A with aural transducers extended;

FIG. 11A is an isometric view of another implementation of a multi-modeheadset, with aural transducers extended;

FIG. 11B is a side view of the implementation of a multi-mode headset ofFIG. 11A with aural transducers extended; and

FIG. 11C is a top view of the implementation of a multi-mode headset ofFIG. 11A with aural transducers extended.

In the drawings, like reference numbers generally indicate identical,functionally similar, and/or structurally similar elements.

DETAILED DESCRIPTION

The following description in conjunction with the above-referencedrawings sets forth a variety of embodiments for exemplary purposes,which are in no way intended to limit the scope of the described methodsor systems. Those having skill in the relevant art can modify thedescribed methods and systems in various ways without departing from thebroadest scope of the described methods and systems. Thus, the scope ofthe methods and systems described herein should not be limited by any ofthe exemplary embodiments and should be defined in accordance with theaccompanying claims and their equivalents.

The present disclosure describes a multi-mode headset incorporating bothbone conduction and aural transducers. Bone conduction plates of theheadset rest on a users' temples, just in front of each ear in oneimplementation, and create sound through vibrations in a first mode,allowing the user to listen to the headset while still leavingenvironmental or external sounds audible. In a second mode, the userdetaches aural transducers or earbuds from an attachment point, such asa magnetic “nest” or retention element, and inserts them into the user'sears, blocking external noise and providing passive (and, in someimplementations, active) noise isolation. In a third mode, the user mayuse both the aural transducers or earbuds and bone conduction platessimultaneously, providing additional amplitude and potentially widerfrequency response. The headset may include a switch, such as a magneticproximity sensor detecting the position of the aural transducers, tocontrol a mixer or amplifier to re-route audio through the auraltransducers. Accordingly, the user may switch between modes and listento high quality, noise-isolated audio; or audio while remaining aware ofexternal noises. In some implementations, the headset may alsoincorporate magnetic proximity sensors, one or more noise-cancellingmicrophones, Bluetooth or other wireless connectivity, micro-USB port orsimilar interfaces for data and/or battery charging, wireless battercharging, rechargeable batteries such as lithium ion batteries,water-resistant or water-proof sealing, and/or passive sound dampeningelements to reduce sound leakage.

FIG. 1A is an illustration of a multi-mode headset 100 in a first,bone-conduction mode, according to one implementation, and FIG. 1B is anillustration of the multi-mode headset 100 of FIG. 1A in a second orthird aural mode, according to one implementation. Headset 100 mayinclude an aural transducer 102 which may be moved between two positions102 a, 102 b as shown. In a first mode illustrated in FIG. 1A, the auraltransducer 102 a is retained, either mechanically or magnetically,adjacent to a frame portion of the headset. The frame portion may bereferred to as a “nest”, retention point, basket, or by other suchterms. The nest may include a magnetic proximity sensor (e.g. triggeredby a magnetic portion of aural transducer 102 or by a separate magnet ina frame or enclosure of aural transducer 102) or mechanical switch todetect the positioning of the transducer 102. When in the first position102 a, audio is routed to a bone conduction transducer 104 that rests onthe skin over the temple, jawbone, or other such area of the user.

The user may detach the aural transducer from the nest and insert anearbud portion into the user's ear in position 102 b, as shown in FIG.1B. Upon detection of the absence of the transducer in the nest by themagnetic or mechanical switch in the nest, the headset may reroute audioto the aural transducers. In some implementations, in a third mode, amix of audio may be provided to both the bone conduction and auraltransducers. For example, in one such implementation, additional lowfrequency audio or bass may be provided via the bone conductiontransducers.

In some implementations, a portion of the frame of the headset connectedto or enclosing aural transducer 102 may be flexible, such as arubberized material, allowing the user to freely move the transducerfrom the nest to an in-ear position and back. In other implementations,said portion of the frame of the headset may comprise a hinge or balljoint or other mechanism to allow the user to move the transducerbetween positions. In some implementations, the aural transducer 102 maybe connected to the headset by a wire or cable, as shown in FIG. 1D,discussed below. In a further implementation, such a cable may beextendable so that the transducer 102 may be extended from a nestposition in the frame of the headset to the user's ear. In someimplementations, the cable may be held under tension by a spring-loadedretraction mechanism.

FIGS. 1A and 1B illustrate a left portion of the headset in oneimplementation. The left portion may be connected via a band 106 to acorresponding right portion (not illustrated). As shown, band 106 may beoriented to be worn behind the head of the user when in use, while inother implementations, band 106 may be oriented to be worn over the topof the head of the user. In many implementations, band 106 may include apower element, such as a rechargeable battery, and/or an antenna forwireless connectivity (e.g. Bluetooth or similar near fieldcommunication systems).

In many implementations, a portion of the frame of the headset 100 mayinclude control buttons, such as buttons for play/pause, forward, back,volume, and power, to allow a user to control their listening experienceand/or answer telephone calls on a connected smart phone or otherdevice. In one implementation, one or more control buttons may be placedon a portion of the frame above a bone conduction transducer 104 asshown.

In some implementations, headset 100 may include passive noisecancelling features when in use in the second or third, aural modes,such as rubberized pads on the aural transducers to form a tight orsound-blocking seal over or in the user's ear canals. The headset 100may also include active noise cancellation, such as one or moremicrophones to receive external or ambient noise. Such ambient noise maybe reproduced by the aural transducers with a delay and/or phaseinversion to acoustically cancel the noise. In some implementations,such microphones may be placed on a portion of the frame of the headsetabove the aural transducer 102, so as to be in close proximity to thetransducer. In still other implementations, the headset may include oneor more microphones for receiving the user's speech, for use with phonecalls, speech commands, voice-to-text, or other such features.

To prevent noise leakage from the headset, in some implementations, thebone conduction transducers may be held in place on the user's skin witha critically damped system of shock absorption and/or tension. Thismechanism may absorb vibrations of the bone conduction transducer,preventing them from propagating further through the headset. Suchimplementations may also increase the effectiveness of the boneconduction transducers, requiring less electrical power for the sameaudible volume, increasing battery life.

In some implementations, the headset may incorporate a rechargeablebattery, such as a lithium-ion battery. The battery may be charged via aplug by an external voltage supply, such as a micro-universal serial bus(USB) plug or similar plug; or may be charged via a wireless chargingsystem, such as the Qi inductive power standard. In one suchimplementation, the headset may incorporate a wireless power receiver,including an inductive coil and rectifier.

In some implementations, the headset 100 may be waterproofed or sealedagainst water. The headset 100 may be capable of playing audio, forexample through the bone conduction transducer, while underwater. Insome such implementations, the headset 100 may include internal memoryfor storing and playing back audio, as the water may block wirelesssignals from other devices.

In some implementations, the headset 100 may include an audio inputport, such as an ⅛th inch stereo jack. This may allow the user to usethe headset 100 with devices not capable of Bluetooth or other wirelesscommunication.

FIG. 1C is an illustration of a portion of a multi-mode headset 100,according to one implementation, showing an interior side of the frameand transducers 102, 104. The materials covering one or eithertransducer may include rubber, plastic, foamed plastic or rubber, or anyother type and form of material.

FIG. 1D is an illustration of a multi-mode headset 100′, according toanother implementation, including removable earbuds 102 connected via acable 107 to the headset. As discussed above, in such implementations,the cable may be extendable so that the aural transducer 102 may beextended from a nest position 108 in the frame of the headset to theuser's ear. In some implementations, the cable may be held under tensionby a spring-loaded retraction mechanism. The retraction mechanism mayinclude a locking mechanism, such that the user may use the earbuds in acomfortable position without any tension applied to cable 107. Whenending use or switching between modes, the user may pull on the cable107 slightly to release tension, releasing the locking mechanism, andallowing the spring to retract cable 107. Such locking mechanisms mayinclude, for example, a spool or take up reel, a ratchet and aspring-loaded pawl. In other implementations, the cable may be undergentle tension continuously, but to a low level that is notuncomfortable during wear. In still other implementations, the cable maynot have a retraction mechanism, and the user may manually push cable107 into the headset when switching modes.

In some implementations, the earbud or aural transducer 102 may fitsnugly into nest position 108. For example, a portion of nest position108 may comprise a cavity lined in a compressible material, such asrubber, neoprene, or other such material that may compress slightly andretain the earbud through friction when not in use. In otherimplementations, nest position 108 may include a magnet to attract acorresponding magnet in transducer 102, such as a permanent magnet in adriver of the transducer. Accordingly, when not in use, the transducermay be magnetically retained within the nest 108 in suchimplementations.

FIGS. 1E and 1F are isometric and side views of a multi-mode headset100″, according to another implementation. As with the implementation ofFIG. 1D, the transducer 102 may be attached by a cable 107 to theheadset. Cable 107 may comprise a flat (e.g. ribbon) cable as shown or around (e.g. coaxial or twisted pair) cable, including conductors forproviding audio signals to transducer 102. In some implementations,cable 107 may include additional elements, such as electromagnetic orelectrostatic shielding, or strengthening elements such as fabric orthread to reduce tension on the conductors.

As shown in FIG. 1F, a nest portion 108 of the headset may be part of asurface of the headset and not include an embedded cavity, in someimplementations. In such implementations, transducer 102 may be retainedwhen not in use by a magnet, as discussed above. In otherimplementations, a portion of the enclosure of transducer 102 mayinclude one or more slots to fit with corresponding tabs on the edges ofnest 108, allowing the transducer 102 to slide with only one degree offreedom when positioned in the nest 108. As discussed above, in someimplementations, cable 107 may be held under tension by a retractionmechanism, opposing any sliding motion.

FIG. 2 is a block diagram of an implementation of a multi-mode headset100. As discussed above, the headset may include a power supply 202. Insome implementations, power supply 202 may include a battery 204, suchas a rechargeable battery. The battery may be charged via a chargingjack 206 and/or via a wireless power receiver 208. Referring ahead toFIG. 3A, illustrated is a schematic of a wireless power receiver for amulti-mode headset, according to one implementation. In oneimplementation, the power receiver may comprise an inductive coil and apower supply integrated circuit, such as a BQ51003 Qi-compliant powersupply manufactured by Texas Instruments, Inc., or any other type andform of wireless power receiving circuitry. The receiver 208 may supplypower to a power supply 202, such as an implementation of the powersupply 202 illustrated in the schematic of FIG. 3B.

Returning to FIG. 2, the headset may include a communication interface210 for receiving and/or transmitting audio or other data. Thecommunication interface 210 may include a wired interface, such as an⅛th inch TRS stereo jack, or a wireless interface, such as a Bluetoothinterface, 802.11 (WiFi) interface, cellular interface, or other suchinterface. The communication interface 210 may comprise one or moreantennas 212, which may be positioned within or along a portion of aframe 106 of the headset 100, such as in a band to be worn across theback or top of the head of the user, or in any other portion of theframe. The communication interface 210 may allow the headset tocommunicate or be paired with any other type and form of computingdevice, such as a smart phone, tablet, desktop computer, laptopcomputer, or other such device. In other implementations, thecommunication interface 210 may allow the headset to receive analogaudio from another device. In still other implementations, thecommunication interface 210 may allow the headset to receive and/ortransmit audio or other data via a network, such as a local areanetwork, wide area network such as the Internet, cellular network, orany combination of these or other networks.

In some implementations, the headset 100 may include a processor 214 anda memory 216. The processor may be any logic circuitry that responds toand processes instructions fetched from a memory unit 216 or otherstorage, or performs other functions. The processor may be provided by amicroprocessor unit, such as: those manufactured by Intel Corporation ofSanta Clara, Calif.; those manufactured by Motorola Corporation ofSchaumburg, Ill.; those manufactured by Apple Inc. of Cupertino Calif.,or any other single- or multi-core processor, or any other processorcapable of operating as described herein, or a combination of two ormore single- or multi-core processors. Referring briefly to FIGS. 3D and3E, illustrated (divided across the figures for clarity) is a schematicutilizing one such processor 214, a BlueCore CSR8645 integrated circuitmanufactured by Cambridge Silicon Radio Ltd., including an 80 MHz RISCprocessor, aptX digital audio processor, internal ROM, and Bluetoothcommunication interface. In such implementations, the processor mayprovide Bluetooth pairing and control and audio transmitting andreceiving functionality.

Returning to FIG. 2, headset 100 may include a memory 216. Memory 216may may be one or more memory chips capable of storing data and allowingany storage location to be directly accessed by the processor 214, suchas random access memory (RAM) of any type. In some embodiments, memory216 may include cache memory or other types of memory. Referring brieflyto FIG. 3C, illustrated is a schematic of a memory unit 216 in oneimplementation. Memory unit 216 may comprise an integrated circuit suchas an MX25U8033 8 Mb Flash memory manufactured by Macronix InternationalCo., or any other type and form of memory unit. Memory unit 216 may beRAM, flash memory, a hard drive, an EPROM, or any other type and form ofmemory device or combination of memory devices. Memory 216 may alsoinclude one or more media buffers 118, which may be used for storage ofreceived media files, and/or input or output buffers for playbackengines of a processor 214.

Returning to FIG. 2, a headset 100 may include a bone conductiontransducer 218 and an aural or in-ear transducer 220. Headset 100 mayalso include a mixer 222. In some implementations, mixer 222 mayselectively route audio from the processor 214 to either bone conductiontransducer 218 or aural transducer 220, or both. Thus, although referredto as a mixer 222, in some such implementations, mixer 222 may comprisea multi-pole switch to route a stereo audio signal bus to eithertransducer 218, 220. In another implementation, a mixer 222 may comprisea summing amplifier or other mixing circuit for providing audio atvariable levels to bone conduction transducer 218 and aural transducer220.

In some implementations, as discussed above, switch or mixer 222 mayprovide audio to bone conduction transducer 218 in a first mode and toaural transducer 220 in a second mode, or may provide audio to both boneconduction transducer 218 and aural transducer 220 in a third mode (suchas for additional bass response). For example, in one suchimplementation, a mixer 222 may comprise an inverse multiplexer,selectively providing an input signal to one or more outputs. Forexample, a control circuit may provide a 2-bit signal to direct mixer222 to direct audio to the bone conduction transducer 218 (e.g. on a“01” input), to the aural transducer (e.g. on an “10” input), or to both(e.g. on a “11” input).

Mixer 222 may be controlled by a switch 224, which may comprise one ormore magnetic, mechanical, optical, capacitive, or other such switches.In some implementations, switch 224 may be configured in a firstposition (e.g. engaged) when an aural transducer 220 is positionedwithin a nest of the frame of the headset, and in a second position(e.g. disengaged) when the aural transducer 220 is removed from thenest. For example, switch 224 may comprise a Hall effect sensordetecting a magnetic field of a magnet in transducer 220 when positionedin the nest. In another example, switch 224 may comprise a mechanical oroptical switch positioned on a portion of a cable retraction mechanismconnected to cable between the headset and transducer 220, triggered todetect when the transducer 220 is removed from a position within thenest. In still another example, switch 224 may comprise a physical leafswitch located within the nest, closed when transducer 220 is within thenest.

As discussed above, in some implementations, a multi-mode headset mayhave one mode in which the aural transducer 220 is used alone andanother mode in which both the aural transducer and bone conductiontransducer 218 are used together. In both modes, the aural transducermay be removed from a nest position, triggering switch 224. To switchbetween these modes, in some implementations, a user may manually enableor disable the bone conduction transducer. This may be done via anadditional physical switch or button on the headset, or via a softwareapplication such as an application running on a Bluetooth-paired smartphone. In still another implementation, a second sensor may detectwhether the headset is in position on a user's temples. For example, apiezoelectric or capacitive switch may be positioned within or next tothe bone conduction transducer. When in position on the user's temples,the pressure on the frame or proximity of the user's skin may close theswitch, enabling or activating the bone conduction transducer (forexample, enabling an output of mixer 222, enabling a bit of a controlsignal to an inverse multiplexer of the mixer, etc.). In anotherexample, the headset may include an optical sensor blocked by the user'sskin when the bone conduction transducers are in position on the user'stemples.

Mixer 222 may comprise one or more analog or digital signal processorsor equalizers for adjusting signals to the bone conduction transducer218 and/or aural transducer 220 when in various operating modes. Forexample, bone conduction transducers 218 typically have differentfrequency ranges than aural transducers 220, most often lower, extendingto frequencies below 50 Hz, and sometimes below 20 Hz; and narrower,rarely extending above 12 kHz, and sometimes not above 8 kHz or 4 kHz.In some implementations, audio signals may be filtered before beingprovided to the transducers 218, 220. For example, a low pass filter maybe applied to a signal to the bone conduction transducer 218 limitingfrequencies above 250 Hz, and a high pass filter applied to the signalto the aural transducer 220 limiting frequencies below 125 Hz. This maylimit distortion in each transducer, resulting in a higher fidelitycombined signal. In some implementations, the processors or equalizersmay be controlled by software, such as an application on a Bluetoothpaired smartphone or via a control interface 226, discussed in moredetail below. For example, in one implementation, a crossover frequency(or low pass and high pass filter frequencies) may be user selectable.In another implementation, relative amplitudes of the signals may beuser selectable. For example, in one implementation, a “bass boost” modemay provide a higher amplitude signal to the bone conduction transducerwithout increasing the amplitude of the signal to the aural transducer220. This may provide the user with substantial low end audio withoutoverly stressing an electrostatic diaphragm of an aural transducer 220.

Headset 100 may comprise a control interface 226, which may include oneor more buttons, capacitive switches or touch sensitive surfaces, dials,or other interface elements for allowing a user to control volume,playback, and/or power. The control interface 226 may be positioned atvarious positions around the frame of the headset. In someimplementations, control interface 226 may also include output elements,such as LEDs or other lighting to indicate communication, power, and/orbattery status.

In some implementations, headset 100 may include one or more microphones228. Microphones 228 may include microphones for picking up a user'svoice, such as for telephone calls, voice commands, speech-to-textfunctions, or other such functionality. Microphones 228 may also includeone or more microphones for active noise cancellation, as discussedabove.

Different implementations of headset 100 may include various designs orfeatures, some implementations of which are discussed below andillustrated at FIGS. 4A-8H.

FIGS. 4A and 4B are isometric views of one implementation of amulti-mode headset. FIGS. 4C-4H are plan views of the implementation ofa multi-mode headset of FIGS. 4A and 4B.

FIGS. 5A and 5B are isometric views of another implementation of amulti-mode headset. FIGS. 5C-5H are plan views of the implementation ofa multi-mode headset of FIGS. 5A and 5B. FIG. 5I is an exploded view ofthe implementation of a multi-mode headset of FIGS. 5A and 5B.

FIGS. 6A and 6B are isometric views of another implementation of amulti-mode headset. FIGS. 6C-6H are plan views of the implementation ofa multi-mode headset of FIGS. 6A and 6B. FIG. 6I is an exploded view ofthe implementation of a multi-mode headset of FIGS. 6A and 6B.

FIG. 7A is an illustration of another implementation of a multi-modeheadset. FIGS. 7B and 7C are illustrations of portions of theimplementation of a multi-mode headset of FIG. 7A. As shown in FIG. 7C,in some implementations, the aural transducer may be detachable andremovable from a portion of the frame, rather than bending to an in-earposition as discussed above in connection with FIGS. 1A and 1B.

Similarly, FIG. 7D is an illustration of still another implementation ofa multi-mode headset incorporate a removable aural transducer. FIGS.7E-7G are an isometric view, side view, and top view of animplementation of an earpiece or removable aural transducer for amulti-mode headset. FIGS. 7H-7J are an isometric view, side view, andtop view of an implementation of an audio-producing portion of amulti-mode headset with both a detachable wireless aural transducer anda bone conducting speaker. FIGS. 7K-7M are an isometric view, side view,and top view of an implementation of a bone conducting speaker on anaudio-producing portion of a multi-mode headset.

FIG. 8A is an illustration of another implementation of a multi-modeheadset. As discussed above, some implementations of headsets mayinclude exterior buttons for control of volume, playback, or otherfunctions. Illustrated in FIGS. 8B and 8C are left and right portions,respectively, of the implementation of a multi-mode headset of FIG. 8A,showing examples of such control interfaces. FIGS. 8D and 8E areillustrations of left and right sides, respectively, of theimplementation of a multi-mode headset of FIG. 8A, in position on auser's head.

As discussed above, in some implementations, a headset may include aband for positioning behind or above the user's head. FIG. 8F is anillustration of a rear portion of the implementation of a multi-modeheadset of FIG. 8A showing one possible implementation of such abehind-the-head band. The band may incorporate a rechargeable battery,antenna, or other such features.

FIGS. 8G and 8H are illustrations of an interior portion of theimplementation of a multi-mode headset of FIG. 8A in a bone-conductionand aural mode, respectively. In FIG. 8H, a rubber earpiece is shownremoved from the aural transducer. In many implementations, the earpiecemay be replaceable or may be removed for cleaning purposes.

FIGS. 9A-9C are schematic diagrams of audio circuitry forimplementations of a multi-mode headset. Specifically, FIG. 9A is aschematic illustrating connections to and from an integrated wirelessaudio processor in some implementations of a multi-mode headset, such asa Synic IA2S6 integrated wireless audio processor, a Broadcom BCM2037wireless audio processor, or any other type and form of audio processorincorporating a wireless interface (such as Bluetooth). The processormay pair or otherwise communicate with a remote device, such as atablet, smartphone, or other computing device, and may transmit andreceive audio. As discussed above, in some implementations, audio may beretrieved and decoded from on-board storage, such as flash memory orother storage.

FIG. 9B is a schematic of connections to and from an audio codec in someimplementations of a multi-mode headset, such as a WM8994 codecmanufactured by Wolfson Microelectronics, or any other such type andform of audio A/D and D/A codec. In some implementations, the codec mayhave an integrated amplifier, while in other implementations, separateamplification components (not illustrated) may be included.

FIG. 9C is a schematic of a power supply and management interface forsome implementations of a multi-mode headset. In some implementations,the headset may incorporate wireless charging components, while in otherimplementations, an input jack may be used (e.g. micro USB, coaxial DC,or any other type and form of interface).

FIG. 10A are two isometric views of another implementation of amulti-mode headset 100. As discussed above, aural transducers 102, suchas earbuds, may be stored in a nest, holder, or retention position whennot in use. In many implementations, a switch or sensor within the nestor holder (e.g. a physical switch, magnetic switch, capacitive sensor,optical source and/or sensor, etc.) may detect the presence or absenceof the aural transducers and disable or enable playback via the auraltransducers accordingly, as discussed above. Bone conduction transducers104 may be positioned during use over a user's temples or jawbone, asdiscussed above. FIGS. 10B and 10C are left and right views,respectively, of the implementation of a multi-mode headset of FIG. 10A.As shown in FIG. 10B, in some implementations, one or more controls 110may be included on a portion of the headset, such as the band 106.Controls 110 may allow control over volume, pausing or playback ofaudio, skipping functions, answering or initiating telephone calls, orother such functions. FIGS. 10D and 10E are top and bottom views,respectively of the implementation of a multi-mode headset of FIG. 10A.

FIG. 10F is an isometric view of the implementation of a multi-modeheadset of FIG. 10A with aural transducers 102 extended, showing cable107 and nest or retention holder 108. FIG. 10G is a side view of theimplementation of a multi-mode headset of FIG. 10A with auraltransducers extended, and FIG. 10H is a top view of the implementationof a multi-mode headset of FIG. 10A with aural transducers extended.

The implementation of the multi-mode headset illustrated in FIGS.10A-10H has bone conduction transducers 104 on a lowered portion of theframe or band. FIG. 11A is an isometric view of another implementationof a multi-mode headset with bone conduction transducers 104 in-linewith the frame. Aural transducers 102 are extended in the view shown.FIG. 11B is a side view of the implementation of a multi-mode headset ofFIG. 11A with aural transducers extended; and FIG. 11C is a top view ofthe implementation of a multi-mode headset of FIG. 11A with auraltransducers extended.

Accordingly, the above disclosure is directed, in a first aspect, to amulti-mode audio headset. The headset includes a stereo pair of boneconduction transducers; a stereo pair of aural transducers; andcircuitry for selectively routing a stereo audio signal to the stereopair of bone conduction transducers or the stereo pair of auraltransducers.

In some implementations, the circuitry comprises a switch configured toroute the stereo audio signal to either the stereo pair of boneconduction transducers or the stereo pair of aural transducers. In otherimplementations, the circuitry comprises an inverse multiplexerconfigured to: in a first mode, route the stereo audio signal to thestereo pair of bone conduction transducers; in a second mode, route thestereo audio signal to the stereo pair of aural transducers; and in athird mode, route the stereo audio signal to the stereo pair of boneconduction transducers and the stereo pair of aural transducers. Instill other implementations, the circuitry comprises a mixer configuredto: in a first mode, route the stereo audio signal to the stereo pair ofbone conduction transducers; in a second mode, route the stereo audiosignal to the stereo pair of aural transducers; and in a third mode,route the stereo audio signal to the stereo pair of bone conductiontransducers and the stereo pair of aural transducers. In a furtherimplementation, the headset includes an equalizer configured to performa first equalization of the stereo audio signal in the first mode, and asecond, different equalization of the stereo audio signal in the thirdmode.

In some implementations, the headset includes a pair of audio cables,each connected to a corresponding aural transducer of the stereo pair ofaural transducers; and a pair of cable retraction mechanisms, eachconfigured to retract a corresponding audio cable of the pair of audiocables. In a further implementation, the pair of cable retractionmechanisms each comprise a take up reel, ratchet, and spring.

In some implementations, the headset includes a wireless transmitterconfigured for transmitting the stereo audio signal; and the stereo pairof aural transducers each comprise a wireless receiver configured toreceive a portion of the stereo audio signal from the wirelesstransmitter. In other implementations, the headset includes a frameconnected to the stereo pair of bone conduction transducers. In afurther implementation, the frame further comprises a pair of retentionnests configured to hold a corresponding aural transducer of the stereopair of aural transducers when not in use. In a still furtherimplementation, at least one retention nest of the pair of retentionnests further comprises a switch configured to detect presence of anaural transducer of the stereo pair of aural transducers within theretention nest. In a yet still further implementation, the switchcomprises a magnetic switch. In another yet still furtherimplementation, the switch comprises a physical switch. In yet anotheryet still further implementation, the circuitry for selectively routingthe stereo audio signal is further configured to route the stereo audiosignal to the stereo pair of aural transducers responsive to a lack ofdetection, by the switch, of presence of the aural transducer of thestereo pair of aural transducers within the retention nest.

In some implementations, the headset includes a wireless receiver andcommunications interface configured to establish a communication linkwith a computing device. In a further implementation, the headsetincludes a memory device configured for storing audio data. In anotherfurther implementation, the headset includes a microphone. In otherimplementations, the headset includes a battery and wireless powerreceiver connected to the battery.

In another aspect, the present disclosure is directed to a method ofoperating a multi-mode audio headset. The method includes operating amulti-mode headset comprising a stereo pair of bone conductiontransducers and a stereo pair of aural transducers in a first mode ofoperation, each of the aural transducers of the stereo pair positionedwithin a retention nest of a corresponding pair of retention nests of aframe of the multi-mode headset, the stereo pair of aural transducersdisabled in the first mode of operation. The method also includesextracting the aural transducers from the retention nests to switch to asecond mode of operation; and operating the multi-mode headset in thesecond mode of operation, the stereo pair of aural transducers enabledin the second mode of operation.

In some implementations, the method includes replacing the auraltransducers in the retention nests to switch to the first mode ofoperation; and operating the multi-mode headset in the first mode ofoperation after replacing the aural transducers in the retention nests,the stereo pair of aural transducers again disabled in the first mode ofoperation.

Having described certain embodiments of systems for multi-mode headsetsincorporating bone conduction and aural transducers, it will now becomeapparent to one of skill in the art that other embodiments incorporatingthe concepts of the invention may be used.

What is claimed:
 1. A multi-mode audio headset, comprising: a stereopair of bone conduction transducers; a stereo pair of aural transducers;a frame, connected to the stereo pair of bone conduction transducers,comprising a pair of retention nests configured to hold a correspondingaural transducer of the stereo pair of aural transducers when not inuse, wherein at least one retention nest of the pair of retention nestsfurther comprises a switch configured to detect presence of an auraltransducer of the stereo pair of aural transducers within the retentionnest; and circuitry for selectively routing a stereo audio signal to thestereo pair of bone conduction transducers or the stereo pair of auraltransducers.
 2. The multi-mode audio headset of claim 1, wherein thecircuitry comprises a switch configured to route the stereo audio signalto either the stereo pair of bone conduction transducers or the stereopair of aural transducers.
 3. The multi-mode audio headset of claim 1,wherein the circuitry comprises an inverse multiplexer configured to: ina first mode, route the stereo audio signal to the stereo pair of boneconduction transducers; in a second mode, route the stereo audio signalto the stereo pair of aural transducers; and in a third mode, route thestereo audio signal to the stereo pair of bone conduction transducersand the stereo pair of aural transducers.
 4. The multi-mode audioheadset of claim 1, wherein the circuitry comprises a mixer configuredto: in a first mode, route the stereo audio signal to the stereo pair ofbone conduction transducers; in a second mode, route the stereo audiosignal to the stereo pair of aural transducers; and in a third mode,route the stereo audio signal to the stereo pair of bone conductiontransducers and the stereo pair of aural transducers.
 5. The multi-modeaudio headset of claim 4, further comprising an equalizer configured toperform a first equalization of the stereo audio signal in the firstmode, and a second, different equalization of the stereo audio signal inthe third mode.
 6. The multi-mode audio headset of claim 1, furthercomprising: a pair of audio cables, each connected to a correspondingaural transducer of the stereo pair of aural transducers; and a pair ofcable retraction mechanisms, each configured to retract a correspondingaudio cable of the pair of audio cables.
 7. The multi-mode audio headsetof claim 6, wherein the pair of cable retraction mechanisms eachcomprise a take up reel, ratchet, and spring.
 8. The multi-mode audioheadset of claim 1, further comprising a wireless transmitter configuredfor transmitting the stereo audio signal; and wherein the stereo pair ofaural transducers each comprise a wireless receiver configured toreceive a portion of the stereo audio signal from the wirelesstransmitter.
 9. The multi-mode audio headset of claim 1, wherein theswitch comprises a magnetic switch.
 10. The multi-mode audio headset ofclaim 1, wherein the switch comprises a physical switch.
 11. Themulti-mode audio headset of claim 1, wherein the circuitry forselectively routing the stereo audio signal is further configured toroute the stereo audio signal to the stereo pair of aural transducersresponsive to a lack of detection, by the switch, of presence of theaural transducer of the stereo pair of aural transducers within theretention nest.
 12. The multi-mode audio headset of claim 1, furthercomprising a wireless receiver and communications interface configuredto establish a communication link with a computing device.
 13. Themulti-mode audio headset of claim 12, further comprising a memory deviceconfigured for storing audio data.
 14. The multi-mode audio headset ofclaim 12, further comprising a microphone.
 15. The multi-mode audioheadset of claim 12, further comprising a battery and wireless powerreceiver connected to the battery.
 16. A method of operating amulti-mode audio headset, comprising: operating a multi-mode headsetcomprising a stereo pair of bone conduction transducers and a stereopair of aural transducers in a first mode of operation, each of theaural transducers of the stereo pair positioned within a retention nestof a corresponding pair of retention nests of a frame of the multi-modeheadset, the stereo pair of aural transducers disabled in the first modeof operation; extracting the aural transducers from the retention neststo switch to a second mode of operation; and operating the multi-modeheadset in the second mode of operation, the stereo pair of auraltransducers enabled in the second mode of operation.
 17. The method ofclaim 16, further comprising: replacing the aural transducers in theretention nests to switch to the first mode of operation; and operatingthe multi-mode headset in the first mode of operation after replacingthe aural transducers in the retention nests, the stereo pair of auraltransducers again disabled in the first mode of operation.